extract docker service from runner

Author: bivas

helper/command.go

@@ -0,0 +1,46 @@
+package helper
+
+import (
+	"io"
+	"log"
+	"os/exec"
+	"strings"
+)
+
+type Command interface {
+	Run() (string, error)
+	Stdin() io.WriteCloser
+	Kill()
+}
+
+type command struct {
+	name  string
+	args  []string
+	under *exec.Cmd
+}
+
+func (c *command) Stdin() io.WriteCloser {
+	pipe, e := c.under.StdinPipe()
+	if e != nil {
+		log.Fatal("error setting up stdin", e)
+	}
+	return pipe
+}
+
+func (c *command) Kill() {
+	c.under.Process.Kill()
+}
+
+func (c *command) Run() (string, error) {
+	log.Println("Running", c.name, c.args)
+	out, err := c.under.CombinedOutput()
+	return strings.TrimSpace(string(out)), err
+}
+
+func NewCommand(name string, args []string) Command {
+	return &command{
+		name:  name,
+		args:  args,
+		under: exec.Command(name, args...),
+	}
+}

helper/docker_helper.go

@@ -0,0 +1,32 @@
+package helper
+
+import (
+	"fmt"
+	"log"
+	"time"
+)
+
+const (
+	bootTimeout = 30
+)
+
+func NewDockerCommand(args ...string) Command {
+	return NewCommand("docker", args)
+}
+
+func WaitForContainer(container string) error {
+	filterPs := []string{"ps", "-aq", "--filter", "name=" + container}
+	id, _ := NewDockerCommand(filterPs...).Run()
+	for i := 0; ; i++ {
+		if i > bootTimeout {
+			return fmt.Errorf("Unable to start container after %d seconds", bootTimeout)
+		}
+		log.Println("Waiting for container to be available", container, id)
+		time.Sleep(1 * time.Second)
+		if id != "" {
+			return nil
+		}
+		id, _ = NewDockerCommand(filterPs...).Run()
+	}
+	return nil
+}

runner/file.go renamed to helper/file.go

@@ -1,8 +1,8 @@
-package runner
+package helper
 
 import "os"
 
-func exists(path string) bool {
+func Exists(path string) bool {
 	_, err := os.Stat(path)
 	if err == nil {
 		return true
@@ -13,7 +13,7 @@ func exists(path string) bool {
 	return true
 }
 
-func isFile(path string) bool {
+func IsFile(path string) bool {
 	info, err := os.Stat(path)
 	if err != nil {
 		return false

helper/git.go

@@ -0,0 +1,56 @@
+package helper
+
+import (
+	"gopkg.in/src-d/go-git.v4"
+	"io"
+	"sort"
+	"time"
+)
+
+type timedHash struct {
+	When time.Time
+	Hash string
+}
+
+type timeSlice []timedHash
+
+func (p timeSlice) Len() int {
+	return len(p)
+}
+
+// Define compare
+func (p timeSlice) Less(i, j int) bool {
+	return p[i].When.Before(p[j].When)
+}
+
+// Define swap over an array
+func (p timeSlice) Swap(i, j int) {
+	p[i], p[j] = p[j], p[i]
+}
+
+func LatestCommitHash() (string, error) {
+	r, err := git.PlainOpen(".")
+	if err != nil {
+		return "", err
+	}
+
+	iter, e := r.CommitObjects()
+	if e != nil {
+		return "", e
+	}
+	defer iter.Close()
+	var hashes timeSlice
+	for {
+		commit, err := iter.Next()
+		if err != nil {
+			if err == io.EOF {
+				break
+			}
+			return "", err
+		}
+		hashes = append(hashes, timedHash{commit.Author.When, commit.Hash.String()})
+	}
+
+	sort.Sort(hashes)
+	return hashes[len(hashes)-1].Hash, nil
+}